Planetary transmission

ABSTRACT

This invention is concerned with the combination of a spur gear planetary transmission and a split sheave power input clutched by a V-belt.

Uniteti States Patent Kamlukin et a1.

May 8, 1973 PLANETARY TRANSMISSION Inventors: Igor Kamlukin, Mequon;Peter P. Konyha, Port Washington, both of Wis.

Assignee: Simplicity Manufacturing Company,

Inc., Port Washington, Wis.

Filed: Mar. 29, 1972 Appl. No.: 239,245

US. Cl. ..74/792, 74/203, 74/220 Int. Cl ..F16h 57/10, F16h 15/00, F16h11/02 Field of Search ..74/792, 203, 220;

References Cited UNITED STATES PATENTS Petronovich ..74/792 Mnsgrgvg....l92/l1 Hotz "I ....74/792 Halls et al v ....74/792 Edwards....l92/1l Tashiro ....74/792 Schlosser ..74/792 Primary Examiner-ArthurT. McKeon Attorney-Kenneth C. McKivett et a1.

ABSTRACT This invention is concerned with the combination of a spur gearplanetary transmission and a split, sheave power input clutched by aV-belt.

8 Claims, 6 Drawing Figures PATENTEB HAY 81973 SHEET 1 BF 2 PAIENTEBHAY8191s SHEET 2 BF 2 |6 FORWARD REVERSE POWER FLOW REVERSE POWER PLANETARYTRANSMISSION The object of this invention is to provide a simple andeffective means for easily and quickly reversing the direction ofa driveshaft in a tractor.

A further object is to accomplish this desired result with aninexpensive mechanism.

A further object of this invention is to provide brake means forcontrolling a driven mechanism and which means are automaticallyoperated in response to shifting a control mechanism to either a forwardor reverse speed.

Another object of this invention is to provide an inexpensivecombination of a split sheave with a spur gear planetary assembly.

Another object of this invention is to provide a direct forward drivewhich is accomplished by tightening a V- belt about a split sheavekeyedto an output shaft and about a power input sheave mounted on apower output shaft.

FIG. 1 is a side elevation view of the planetary transmission, sheavesand hand and foot controls concerned with this invention;

FIG. 2 is a top view of the mechanism shown in FIG.

FIG. 3 is a cross sectional view taken generally on line Ill-lll of FIG.1 and illustrating the power flow;

FIG. 4 is a cross sectional view taken on line lV-IV of FIG. 1 showingthe pinion associated with the reverse power flow;

FIG. 5 is a cross sectional view similar to FIG. 3 but using a Vbelt tobrake the planetary carrier; and

FIG. 6 is a cross sectional view similar to FIG. 4 using a V-belt as inFIG. 5.

Referring to FIG. 2 a planetary transmission 10 is provided including asheave half 11 which is keyed to a power output shaft 12. A sheave 13 ispositioned proxi mate to sheave half 11 so that a V-belt 14 can bepositioned between sheave half 11 and the adjacent surface 16 of sheave13 to establish a driving relation therebetween. In other words, whenbelt 14 is tightened up sufficiently, sheave half 11 moves with sheave13 as though it were directly attached thereto. Sheave 13 is attached toa hub portion ofgear 17 (see FIG. 5) which hub portion is positionedabout shaft 12 and spaced therefrom by roller bearing assembly 18. Aspur gear 19 is attached to shaft 12 by key 21. A thrust washer 22separates gear 17 from gear 19. A planetary assembly 23 is positioned toencircle an indented portion 24 of gear 19 and is spaced therefrom byflange bearing 26. Planetary assembly 23 includes a planetary carrier 27to which are bolted differential covers 28 by bolts and nuts 29.Planetary carrier 27 also rotatably supports two pairs of differentialpinions 31 and 32 through the medium of bolts and nuts 29. Gear 19 isretained on shaft 12 by means of nut 33 threadably connected to theoutboard end of shaft 12 for retaining gear 19 abutting thrust washer 22which in turn abuts gear 17. Gear 17 abuts thrust bearing 36 whichcontacts sheave half ll which in turn abuts transmission housing 37 (seeFIG. 2).

As shown in FIG. 2 the periphery of planetary assembly 23 is providedwith a flat belt 38 forming a brake band relative thereto for keepingthe planetary assembly 23 from rotating when desired. The peripheralsurface of planetary assembly 23 may be configured to accept a V-belt 39(FIG. 5 and 6) which upon being tightened will function as a brake onthe assembly.

Referring to FIGS. 1 and 2, one end of belt 38 is attached to a couplingmember 41 in which a turned over portion 42 of one end of a rod 43 ispivotally received. The other end of rod 43 is pivotally attached to onearm 44 of a bell crank lever 46 carried by frame member 47 for pivotalmovement about shaft 48 which is joumaled in frame member 47. The otherend of flat belt 38 is attached to a connector 49 which in turn isconnected to pivot pin 51 carried by frame member 47.

Another arm 52 of bell crank lever 46 has a sheave 53 rotatably attachedthereto. V-belt 14 passes about sheave 53. Guards 54 carried by arm 52prevent V-belt 14 from coming off sheave 53 when the belt is slack.Still another arm 55 of bell crank 46 is attached to shaft 48 adjacentthe end thereof opposite to the end to which arm 44 is attached. Abracket 56 (FIG. 1) attached to frame member 47 supports a verticallyextending pivot pin 57 upon which is pivotally mounted a brake assembly58. At one end assembly 58 is provided with a brake pad member 59coactable with sheave half 11 for braking same. The other end ofassembly 58 is provided with a spring 61 which biases pad member 59 intocontact with sheave half 11. A hand control mechanism 62 includes meansfor retaining pad member 59 out of contact with sheave half 11 whensheave 53 is swung to a position tightening belt 14 on sheave half 11and side 16 of sheave 13. Control mechanism 62 includes a rod member 63upon which is slidably mounted a rod guide 64. A spring 66 encircles rodmember 63 and is restrained by one leg of guide 64 and a stop member 67attached to rod 63. A bolt and nut 68 pivotally connects guide 64 to arm55.

A cam member 69 is attached to rod 63. Brake assembly 58 includes avertically extending pin 71 at- V tached thereto which coacts with cammember 69.

As shown in FIGS. 1 and 2 spring 61 is pivoting brake assembly 58 aboutpivot pin 57 causing brake pad 59 to engage half sheave ll tending tobrake same. At the same time belt 14 is relaxed from half sheave l 1because sheave 53 has been moved to the left as viewed in FIG. 2. Whenhand control 62 ispulled to the right, pin 71 will be cammed downwardlyproducing a pivotal movement of brake assembly 58 about pivot pin 51 andthereby releasing contact between brake pad 59 and sheave half 1 l.Thispull on hand control 62 also causes spring 66 to become compressedagainst the right-hand leg of guide 64 resulting in guide 64 and arm 55moving toward the right which results in a tightening action on belt 14as sheave 53 moves to the right. As sheave 53 moves to the right orclockwise about shaft 48 as viewed in FIG. 1, arm 52 moves likewisetherewith as does arm 44 resulting in a loosening of brake band 38.

When belt 14 is tightened on half sheave l 1 and sheave 13 resulting inthem revolving in unison, this results in a forward drive totransmission housing 37. A drive sheave 72 is attached to drive shaft 73journaled in frame 47. Drive shaft 73 is operatively connected to asource of power (not shown); A drive belt 74 drivingly connects drivesheave 72 to driven sheave 13. An adjustable idler sheave 76 isrotatably mounted on a link plate member 77 which is pivotally mountedon pin 78 carried by plate 77. A rod 79 has one turned over end portion81 pivotally received in link plate member 77. Rod 79 passes through anopening 80 in frame member 47. The other end of rod 79 is provided witha turned over portion 82 pivotally received in the distal end of arm 83which is attached to shaft 84journaled in frame 47 to form a bell cranklever 85. Shaft 84 is provided at its other end with an arm 86 which isconnected to one end of spring 87 having its other end connected to aspring clip attached to frame member 83 for biasing arm 86 in acounterclockwise direction about shaft 84 as viewed in FIG. 1.

A foot clutch rod 89 has its left-hand end as viewed in FIGS. 1 and 2slidably received in a collar member 91 which has a pivot member 92attached thereto and received in an opening in a midportion of arm 86.The left-hand end of rod 89 is threaded to receive a pair of stop nuts93. The right-hand end of rod 89 is provided with conventional meanssuch as detent members (not shown) for retaining rod 89 in a desiredrearward position, the bias of spring 87 thereby retaining plate 77 inits pivoted position with sheave 76 tightening belt 74 to provide adriving relation between sheave 72 and sheave 13 or for retaining rod 89in a desired forward position relaxing belt 74 and thereby interruptingthe drive from sheave 72 to sheave 13.

The right-hand end of hand control rod 63 is provided with conventionalmeans (not shown) for retaining such right-hand end in any of threepositions: a first or forward position wherein belt 14 is tightenedabout sheaves 53 and sheave half 11 and the side 16 of sheave 13 whileremoving brake 59 from contact with sheave half 11 and loosening brakeband 38 allowing movement of planetary carrier 27; a second or reverseposition wherein belt 14 is relaxed so that sheave 13 movesindependently of sheave half 11 while brake 59 is again removed fromcontact with sheave half 11 and brake band 38 is tightened so thatplanetary carrier 27 remains stationary; and a third or neutral positionwherein belt 14 is relaxed so that sheave 13 moves independently ofsheave half 11 which is braked by contact with brake member 59 and brakeband 38 is relaxed so that planetary carrier 27 revolves about shaft 12.

Referring to FIG. 3, the power flow is demonstrated, when it is desiredto drive shaft 12 forwardly, hand control 62 (FIG. 2) is moved to theright, this causes cam 69 to move pin 71 downwardly causing brake member59 to move out of contact with sheave half 11. Such movement of control62 also causes sheave 53 to move to the right and thus tighten belt 14about sheave half 11 and the side 16 of sheave 13 so that they will movein unison. Referring back to FIG. 3 the power enters sheave l3 and istransferred to sheave half 11 which is keyed to shaft 12 and so drivessame. When belt 14 was being tightened belt 38 was being loosened soplanetary assembly 23 will rotate with shaft 12.

When it is desired to drive shaft 12 in reverse hand control 62 is movedto the left, this causes cam 69 to move pin 71 downwardly causing brakemember 59 to move out of contact with sheave half 11. Such movement ofcontrol 62 also causes sheave 53 to move to the left and thus loosenbelt 14 about sheave half 11 and the side 16 of sheave 13 so that sheavehalf 11 no longer moves in unison with sheave 13. When belt 14 was beingloosened belt 38 was being tightened so planetary assembly 23 remainsstationary. So power enters from sheave 13 to sungear 17 to which it isattached. Gear 17 is meshed with differential pinions 31 (see FIG. 4)which is meshed with pinion 32 (FIG. 3). Pinion 32 meshes with gear 19which is keyed to shaft 12 so that the power flow is from sheave 13 togear 17 to pinion 31 to pinion 32 to gear 19 to shaft 12.

When desired control assembly 62 can be shifted to a mid-position orneutral. This is accomplished by mov ing assembly 62 to the left alesser amount than described in the preceding paragraph. This movementis insufficient to cause cam 69 to contact pin 71 and move brake 59 outof contact with sheave half 11. This movement is, however, sufficient tomove belt 14 out of contact with sheave half 11. Such movement ofcontrol 62 is not sufficient to tighten up belt 38. Accordingly, powerflows from belt 14 to sheave 13 to pinion 31 to pinion 32 but instead ofpinion 32 driving gear 19, the planetary assembly 23 rotates about gear19 and shaft 12 which remains stationary.

FIGS. 5 and 6 indicate the use of a V-belt to brake the planetarycarrier 27 in place of the flat belt 38 used in the other figures.

The embodiments of the invention in which an exclusive property orprivilege is claimed as defined as follows:

1. In combination a power output shaft, a power input shaft, a firstsheave attached to said output shaft, a second sheave rotatably mountedon said power input shaft, a first belt drivingly connected between saidfirst and second sheaves, a sheave half keyed to said input shaft inproximity to said second sheave, an adjustable belt tightening sheavemounted on one arm of a bell crank in alignment with said sheave halfand one side of said second sheave, a second belt circling said belttightening sheave and said sheave half and said one side of said secondsheave, said second sheave being attached to a sun gear of a spur geardifferential positioned about said input shaft, said differentialincluding a planetary carrier, first means for braking said planetarycarrier, said first means including a third belt positioned about saidplanetary carrier and tightenable to prevent rotation of said carrier,said first means being actuated by movement of another arm of said bellcrank, and control means connected to a third arm of said bell crank sothat movement of said control means in one direction causes said secondbelt to tighten and said third belt to loosen to provide a forwardrotation of said driven shaft and movement in an opposite directioncauses said second belt to loosen and said third belt to tighten toprovide a reverse rotation of said driven shaft.

2. The combination as recited in claim 1 and wherein brake means forsaid sheave half are provided, said brake means being actuable bymovement of said control means for moving said bell crank to apply saidbrake means to said sheave half when said bell crank is loosening saidsecond belt.

3. The combination as recited in claim 2 and wherein said brake means isbiased into contact with said sheave half and said control meansincludes a cam coactable with brake means when said control means aremoved for removing said brake means from contact with said sheave half.

said third belt is a V-belt.

7. In the combination recited in claim I and wherein said third belt isa flat belt.

8. In the combination recited in claim 1 and wherein a limited movementof said control means in said opposite direction causes said second andthird belts to loosen to provide a neutral nonrotating position of saidpower input shaft.

UNITED STATES PATENT OFFICE (IEIYITFICATE 0F CORRECTION Patent No. '3731 557 Dated May 8 19 73 Inventor) Igor Kamlukin et a1.

It is Certified that error appears in the above-identified patent andthat said Letters Patent are hereby corrected as shown below:

Column 4, line 30, "output" should read input"; in each of lines 31, 33and 41, "input" shouldread output I in each of lines 52 and 55, "driven"should read output Column 6, line 8, "input" should read outputSignedand sealed this 7th day of January 1975.

3 I (SEAL) Attest:

mc cor GIBSON 'JR. I c. mmsmm. DANN "tijfln Officer I Commi-s sioner ofPatents FORM Poimso (0.69) V v i v i USCOMM-DC 00376-P69 US, GOVERNMENTHUNTING OFFICE t 9 9

1. In combination a power output shaft, a power input shaft, a firstsheave attached to said output shaft, a second sheave rotatably mountedon said power input shaft, a first belt drivingly connected between saidfirst and second sheaves, a sheave half keyed to said input shaft inproximity to said second sheave, an adjustable belt tightening sheavemounted on one arm of a bell crank in alignment with said sheave halfand one side of said second sheave, a second belt circling said belttightening sheave and said sheave half and said one side of said secondsheave, said second sheave being attached to a sun gear of a spur geardifferential positioned about said input shaft, said differentialincluding a planetary carrier, first means for braking said planetarycarrier, said first means including a third belt positioned about saidplanetary carrier and tightenable to prevent rotation of said carrier,said first means being actuated by movement of another arm of said bellcrank, and control means connected to a third arm of said bell crank sothat movement of said control means in one direction causes said secondbelt to tighten and said third belt to loosen to provide a forwardrotation of said driven shaft and movement in an opposite directioncauses said second belt to loosen and said third belt to tighten toprovide a reverse rotation of said driven shaft.
 2. The combination asrecited in claim 1 and wherein brake means for said sheave half areprovided, said brake means being actuable by movement of said controlmeans for moving said bell crank to apply said brake means to saidsheave half when said bell crank is loosening said second belt.
 3. Thecombination as recited in claim 2 and wherein said brake means is biasedinto contact with said sheave half and said control means includes a camcoactable with brake means when said control means are moved forremoving said brake means from contact with said sheave half.
 4. Thecombination recited in claim 1 and wherein an adjustable belt tighteningsheave is provided for said first belt, and manually operated means formoving said belt tightening sheave into contact with said first belt toprovide a drive between said first sheave and said second sheave and tointerrupt such drive.
 5. In the combination recited in claim 1 andwherein said second belt is a V-belt.
 6. In the combination recited inclaim 1 and wherein said third belt is a V-belt.
 7. In the combinationrecited in claim 1 and wherein said third belt is a flat belt.
 8. In thecombination recited in claim 1 and wherein a limited movement of saidcontrol means in said opposite direction causes said second and thirdbelts to loosen to provide a neutral nonrotating position of said powerinput shaft.